Overhead Transmission Lines Fault Location Approach based on Current Traveling Waves Measurement

This paper presents an innovative double-ended current traveling wave fault location scheme for overhead transmission lines. The scheme depends on magnetic flux density measured by tunnel magnetoresis-tive sensor array mounted at both ends of an overhead transmission line. The measured data is transmitted to a remote monitoring unit for analysis. The scheme is tested on a 230 KV, 200 km transmission line built in PSCAD. The performance of the proposed scheme is evaluated via a laboratory experiment for several fault situations and has shown high efficiency for current traveling wave fault location. The obtained results are compared with a general traveling wave based scheme for fault location in overhead transmission line to prove its accuracy and efficiency. In all the test cases performed, the proposed scheme offered very good results for all categories of faults.